High peeling strength polysulfide sealant and sealing method

A polysulfide sealant and high-peeling technology, which is applied in the direction of chemical instruments and methods, adhesives, non-polymer adhesive additives, etc., can solve the problem of increased viscosity of sealant, decreased performance of use process, and improved peel strength. Problems, achieve the effect of improving adhesive performance, improving flexibility, and improving peel strength

Active Publication Date: 2014-02-05
BAIMTEC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Jin Gengshuan disclosed in the Chinese patent (ZL200610150004.3) that polysulfide sealant is modified with bisphenol A epoxy resin and coupling agent to obtain a polysulfide sealant with 100% cohesive failure, but adding ring After the oxygen resin is used, the viscosity of the sealant will increase, and the performance of the process will decrease.
In the Chinese patent (ZL201010275582.6), it is disclosed that polyvinyl butyral is used as a tackifier to improve the bonding performance of polysulfide sealants. It is found that the cohesive failure rate is 100% through the bonding test, but the peel strength is not to explain the improvement

Method used

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  • High peeling strength polysulfide sealant and sealing method
  • High peeling strength polysulfide sealant and sealing method
  • High peeling strength polysulfide sealant and sealing method

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preparation example Construction

[0017] The preparation of component A and component B is mixed with a three-roll mill, and each component is weighed according to the proportion, then roughly mixed and then mixed with a three-roll mill for 3 times before use;

[0018] Component A and Component B are kept separately.

[0019] The preparation method of the acrylic end-blocking modified polysulfide rubber in the high peel strength polysulfide sealant as described above is characterized in that: the acrylic end-blocking modified polysulfide rubber is composed of liquid polysulfide rubber and acrylic acid The acrylic compound is obtained by reacting with a free radical initiator at a temperature of 70°C to 80°C for 4 to 6 hours, wherein the acrylic compound has the following structure: R 1 CH=CR 2 COOR 3 , where: R 1 and R 2 is H, CH 3 、CH 2 CH 3 or CH 2 CH 2 CH 3 One of them, considering the activity of the reaction, R 1 and R 2 Preferably H; R 3 is H or (CH 2 ) n CH 3 One of them, n=0~5, preferab...

Embodiment 1

[0021] Embodiment 1: Sealant 1 is a kind of sealant used for oil tank sealing. It is composed of component A base paste and component B vulcanized paste, component A is base paste, and component B is vulcanized paste. Its composition formula is as follows Table 1 shows:

[0022] Formulation composition of table 1 sealant 1

[0023]

[0024] Among them, the synthesis steps of acrylic acid end-capped modified polysulfide rubber I are as follows: 100 parts by weight of liquid polysulfide rubber G44 with a number average molecular weight of 1000 and a crosslinking degree of 0.5%, and 14.4 parts by weight of acrylic acid are put into a reaction bottle , heated in an oil bath to 70°C, added 0.05 parts by weight of azobisisobutyronitrile, stirred and reacted for 6 hours, and cooled to obtain modified polysulfide rubber I;

[0025] Both the base paste and the vulcanizing paste are prepared by mixing with a three-roll mill, then weighed according to a weight ratio of 100:10, mixed ...

Embodiment 2

[0026] Embodiment 2: Sealant 2 is a sealant used for anti-corrosion sealing of bridges, consisting of component A base paste and component B vulcanized paste, component A is base paste, and component B is vulcanized paste, its composition Formula is as shown in table 2:

[0027] Formulation composition of table 2 sealant 2

[0028]

[0029] Among them, the synthesis steps of acrylic acid end-capped modified polysulfide rubber II are as follows: 100 parts by weight of liquid polysulfide rubber LP33 with a number average molecular weight of 1000 and a degree of crosslinking of 0.5%, and 17.2 parts by weight of methacrylic acid are put into the reaction In the bottle, heat the oil bath to 80°C, add 0.05 parts by weight of isobutyl peroxybenzoate, stir and react for 6 hours, and cool to obtain modified polysulfide rubber II;

[0030] Both the base paste and the vulcanizing paste are prepared by mixing with a three-roll mill, then weighed according to a weight ratio of 100:10, ...

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Abstract

The invention belongs to the technical field of polymer sealants, and relates to a high peeling strength polysulfide sealant and a method for sealing by using the sealant. The sealant is composed of a component A-based paste and a component B sulfur paste, wherein the component A is composed of a filler, a plasticizer, a crylic acid-terminated modified polysulfide rubber, a coupling agent and a liquid polysulfide rubber; and the component B is composed of manganese dioxide, dibutyl phthalate and an accelerator D. The invention provides the high peeling strength polysulfide sealant and a sealing method thereof. The adhesive property of the sealant is increased without increasing the viscosity of the sealant.

Description

technical field [0001] The invention belongs to the technical field of polymer material sealant, and relates to a polysulfide sealant with high peeling strength and a sealing method using the sealant. Background technique [0002] Polysulfide sealant refers to liquid polysulfide rubber with a number average molecular weight not greater than 6000 as the base material, mixed with various powder materials, which can be chemically cross-linked at room temperature or under heating conditions to become a metal or other material. Elastic sealing material with good adhesion on the surface. The liquid polysulfide rubber referred to above is mainly the G series products produced by Akzo Nobel Sulfur Rubber Company, or the LP series products produced by Toray Corporation of Japan, or the JLY series products produced by Liaoning Jinxi Chemical Research Institute. Because polysulfide sealants have good fuel resistance, water resistance and weather resistance, they have been widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J181/04C09J11/04C09J11/06C08G75/14C09K3/10
Inventor 章谏正吴松华刘刚秦蓬波
Owner BAIMTEC MATERIAL CO LTD
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